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Method and apparatus providing automatic color balancing for digital imaging systems

A color channel and data technology, applied in image communication, color TV, color signal processing circuit, etc., can solve problems such as changes in scene brightness and color appearance

Active Publication Date: 2009-02-04
MICRON TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the perceived brightness and color appearance of the scene can change due to changes in the spectral power distribution of the lighting

Method used

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  • Method and apparatus providing automatic color balancing for digital imaging systems
  • Method and apparatus providing automatic color balancing for digital imaging systems
  • Method and apparatus providing automatic color balancing for digital imaging systems

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Embodiment Construction

[0015] In the following description, an exemplary imager color space is described as an RGB color space; however, other color imaging protocols may be used in the present invention, including, for example, a subtractive CMYK (cyan, magenta, yellow, black) color space .

[0016] The general processing flow of the present invention will now be described with reference to the drawings. Referring to FIG. 1 , image sensor data from the RGB color space is acquired from an image sensor 2 using a tiled color filter array (eg, a Bayer mosaic filter pattern). A demosaicing process 3 of interpolated tiled Bayer RBG signals is applied to generate Ri, Gi and Bi signals. By collecting the colorimetric statistics of the image and referring to image 3 Computing the channel gains is explained in more detail with 4, in which the Ri, Gi, and Bi signals are color balanced to generate Rb, Gb, and Bb signals. The Rb, Gb and Bb signals are then subjected to a color correction process 5 to generat...

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Abstract

Pixels from an image are sampled for gray world statistics. In order to avoid the effect of saturated regions, the pixels are pruned. If a predetermined percentage of the pixels are included in the gray world statistics, color channel gain is calculated and applied to the image. As a result, color balance is achieved in a simple and efficient manner.

Description

technical field [0001] The present invention relates to imaging devices and more particularly to automatic color balancing techniques for imaging systems. Background technique [0002] Solid-state imagers have been used in optical imaging applications, including charge-coupled devices (CCDs), CMOS imagers, and others. Solid state imager circuitry includes a focal plane array of pixel cells, each of which cells includes a photosensor, which may be a photogate, photoconductor, or photodiode with doped regions for accumulating photogenerated charge. Each pixel cell has a charge storage region formed on or in the substrate that is connected to the gate of an output transistor that is part of the readout circuitry. The charge storage region can be configured as a floating diffusion region. In some imager circuits, each pixel cell may contain at least one electronic device (such as a transistor) for transferring charge from the photosensor to a storage area and for resetting the...

Claims

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Application Information

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IPC IPC(8): H04N9/73
CPCH04N9/735H04N23/88H04N9/73
Inventor 沙恩·C·胡
Owner MICRON TECH INC